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Potential for bleeding with the new beta-lactam antibiotics

F R Sattler, M R Weitekamp, J O Ballard

    Annals of Internal Medicine
    |December 1, 1986
    PubMed

    Insights

    Certain beta-lactam antibiotics can disrupt blood clotting. Cephalosporins with methylthiotetrazole may cause hypoprothrombinemia, while others with alpha-carboxyl groups can impair platelet function, increasing bleeding risk.

    Area of Science:

    • Pharmacology
    • Hematology
    • Internal Medicine

    Background:

    • Beta-lactam antibiotics are widely used, but some can interfere with hemostasis.
    • Specific structural features of beta-lactams are associated with distinct hemostatic defects.

    Purpose of the Study:

    • To review the hemostatic complications associated with various beta-lactam antibiotics.
    • To identify the specific antibiotic structures linked to hypoprothrombinemia and impaired platelet function.

    Main Methods:

    • Literature review of clinical studies and case reports on beta-lactam antibiotic-induced hemostatic abnormalities.
    • Analysis of antibiotic structures and their correlation with observed bleeding risks.

    Main Results:

    • Cephalosporins with methylthiotetrazole substitution (e.g., cefamandole, moxalactam) frequently cause hypoprothrombinemia (4-68% incidence), especially in high-risk patients.
    • Beta-lactams with alpha-carboxyl substitution (e.g., moxalactam, carbenicillin) impair platelet function, prolonging bleeding time.
    • Acylureidopenicillins show less frequent and milder platelet dysfunction.

    Conclusions:

    • Hypoprothrombinemia from methylthiotetrazole-containing cephalosporins requires fresh frozen plasma for treatment.
    • Platelet dysfunction necessitates platelet concentrate transfusions to manage serious hemorrhage.

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